UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 OPR/50.0.2762.67

Example URL:

Steps to reproduce the problem:
When I play a video, This problem is not always appear

What is the expected behavior?

What went wrong?
This is a sample video I captured: 
https://www.youtube.com/watch?v=Qp9Yf9smljo

Sometime when I play a video (fb, youtube..), a 'play/pause' button flashing, it looks so crazy. I'm not really sure what was wrong. But I can see this problem appears on Chromium browser such as: Chrome, Vivaldi, Opera.
In Safari, Firefox, I never seen this. 

Did this work before? N/A 

Is it a problem with Flash or HTML5? N/A

Does this work in other browsers? Yes

Chrome version: 63.0.3239.132  Channel: stable
OS Version: OS X 10.13.0
Flash Version: 

Contents of chrome://gpu: 
Note: To properly save this page, select the "Webpage, Complete" option in the Save File dialog.
Graphics Feature Status
Canvas: Hardware accelerated
CheckerImaging: Disabled
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Hardware accelerated
Rasterization: Hardware accelerated
Video Decode: Hardware accelerated
Video Encode: Hardware accelerated
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
add_and_true_to_loop_condition
adjust_src_dst_region_for_blitframebuffer
avoid_stencil_buffers
decode_encode_srgb_for_generatemipmap
disable_framebuffer_cmaa
disable_webgl_rgb_multisampling_usage
emulate_abs_int_function
get_frag_data_info_bug
init_two_cube_map_levels_before_copyteximage
msaa_is_slow
pack_parameters_workaround_with_pack_buffer
rebind_transform_feedback_before_resume
regenerate_struct_names
remove_invariant_and_centroid_for_essl3
reset_teximage2d_base_level
rewrite_texelfetchoffset_to_texelfetch
scalarize_vec_and_mat_constructor_args
set_zero_level_before_generating_mipmap
unfold_short_circuit_as_ternary_operation
unpack_alignment_workaround_with_unpack_buffer
unpack_image_height_workaround_with_unpack_buffer
use_intermediary_for_copy_texture_image
use_unused_standard_shared_blocks
Problems Detected
Unfold short circuit on Mac OS X: 307751
Applied Workarounds: unfold_short_circuit_as_ternary_operation
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
Mac drivers handle struct scopes incorrectly: 403957
Applied Workarounds: regenerate_struct_names
On Intel GPUs MSAA performance is not acceptable for GPU rasterization: 527565
Applied Workarounds: msaa_is_slow
glGenerateMipmap fails if the zero texture level is not set on some Mac drivers: 560499
Applied Workarounds: set_zero_level_before_generating_mipmap
Pack parameters work incorrectly with pack buffer bound: 563714
Applied Workarounds: pack_parameters_workaround_with_pack_buffer
Alignment works incorrectly with unpack buffer bound: 563714
Applied Workarounds: unpack_alignment_workaround_with_unpack_buffer
copyTexImage2D fails when reading from IOSurface on multiple GPU types.: 581777
Applied Workarounds: use_intermediary_for_copy_texture_image
Multisample renderbuffers with format GL_RGB8 have performance issues on Intel GPUs.: 607130
Applied Workarounds: disable_webgl_rgb_multisampling_usage
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
glGetFragData{Location|Index} works incorrectly on Max: 638340
Applied Workarounds: get_frag_data_info_bug
glResumeTransformFeedback works incorrectly on Intel GPUs: 638514
Applied Workarounds: rebind_transform_feedback_before_resume
Result of abs(i) where i is an integer in vertex shader is wrong: 642227
Applied Workarounds: emulate_abs_int_function
Rewrite texelFetchOffset to texelFetch for Intel Mac: 642605
Applied Workarounds: rewrite_texelfetchoffset_to_texelfetch
Rewrite condition in for and while loops for Intel Mac: 644669
Applied Workarounds: add_and_true_to_loop_condition
Decode and encode before generateMipmap for srgb format textures on macosx: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
Init first two levels before CopyTexImage2D for cube map texture on Intel Mac 10.12: 648197
Applied Workarounds: init_two_cube_map_levels_before_copyteximage
Insert statements to reference all members in unused std140/shared blocks on Mac: 618464
Applied Workarounds: use_unused_standard_shared_blocks
Tex(Sub)Image3D performs incorrectly when uploading from unpack buffer with GL_UNPACK_IMAGE_HEIGHT greater than zero on Intel Macs: 654258
Applied Workarounds: unpack_image_height_workaround_with_unpack_buffer
adjust src/dst region if blitting pixels outside read framebuffer on Mac: 644740
Applied Workarounds: adjust_src_dst_region_for_blitframebuffer
Mac driver GL 4.1 requires invariant and centroid to match between shaders: 639760, 641129
Applied Workarounds: remove_invariant_and_centroid_for_essl3
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
Certain Apple devices leak stencil buffers: 713854
Applied Workarounds: avoid_stencil_buffers
Reset TexImage2D base level to 0 on Intel Mac 10.12.4: 705865
Applied Workarounds: reset_teximage2d_base_level
Checker-imaging has been disabled via finch trial or the command line.
Disabled Features: checker_imaging
Version Information
Data exported	2/3/2018, 8:34:45 PM
Browser version	OPR/50.0.2762.67
Operating system	Mac OS X 10.13.0
Software rendering list version	13.13
Driver bug list version	10.34
ANGLE commit id	unknown hash
2D graphics backend	Skia/63
Command Line	/Applications/Opera.app/Contents/MacOS/Opera --flag-switches-begin --disable-features=SharedArrayBuffer --flag-switches-end --use-turbo2 --prefer-integrated-gpu --disable-quic
Driver Information
Initialization time	57
In-process GPU	false
Passthrough Command Decoder	false
Supports overlays	false
Sandboxed	true
GPU0	VENDOR = 0x8086, DEVICE= 0x0d26 *ACTIVE*
Optimus	false
Optimus	false
AMD switchable	false
Driver vendor	
Driver version	10.28.26
Driver date	
Pixel shader version	4.10
Vertex shader version	4.10
Max. MSAA samples	8
Machine model name	MacBookPro
Machine model version	11.4
GL_VENDOR	Intel Inc.
GL_RENDERER	Intel Iris Pro OpenGL Engine
GL_VERSION	4.1 INTEL-10.28.26
GL_EXTENSIONS	GL_ARB_blend_func_extended GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_ES2_compatibility GL_ARB_explicit_attrib_location GL_ARB_gpu_shader_fp64 GL_ARB_gpu_shader5 GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_occlusion_query2 GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_shading_language_include GL_ARB_tessellation_shader GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_swizzle GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_vertex_attrib_64bit GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_sRGB_decode GL_APPLE_client_storage GL_APPLE_container_object_shareable GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_texture_range GL_ATI_texture_mirror_once GL_NV_texture_barrier
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Window system binding vendor	
Window system binding version	
Window system binding extensions	
Direct rendering	Yes
Reset notification strategy	0x0000
GPU process crash count	0
Compositor Information
Tile Update Mode	Zero-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	Software only
RGBA_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
BGRX_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE
BGRA_8888	GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
RGBA_F16	GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
YVU_420	Software only
YUV_420_BIPLANAR	GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
UYVY_422	GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT
Display(s) Information
Info	Display[69733312] bounds=0,0 1680x1050, workarea=0,23 1680x1027, scale=2, external
Color space information	{primaries:[[0.4443,0.3794,0.1404,],[0.2248,0.7262,0.0491,],[0.0055,0.0780,0.7415,],], transfer:0.0774*x + 0.0000 if x < 0.0404 else (0.9479*x + 0.0521)**2.4000 + 0.0000, matrix:RGB, range:FULL, icc_profile_id:10}
Bits per color component	8
Bits per pixel	24
Log Messages
[0203/181617.266201:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/182302.557953:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/192232.565017:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/192333.930274:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/192514.364649:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/192758.179498:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/192804.182550:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/193114.054411:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/193206.128071:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/194447.544191:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/194451.016093:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/195736.398917:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/195736.398952:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/200135.970579:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1
[0203/202633.379608:WARNING:ipc_message_attachment_set.cc(49)] : MessageAttachmentSet destroyed with unconsumed attachments: 0/1