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Discontinue excluding excessive CSS by default on Standard mode sites #2326

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westonruter opened this issue May 15, 2019 · 27 comments
Closed

Discontinue excluding excessive CSS by default on Standard mode sites #2326

westonruter opened this issue May 15, 2019 · 27 comments

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@westonruter
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@westonruter westonruter commented May 15, 2019

Currently when there is too much CSS, the first stylesheet that exceeds the 50KB limit is excluded from being included on the page. This leads to pages that appear broken. While prioritizing the stylesheets to concatenate will help a lot (#2322), we should also consider whether we should exclude stylesheets by default. This is particularly important when activating AMP on a theme that has more than 50KB of CSS even without the admin bar, or when a certain combination of blocks causes more than 50KB of CSS to be added to the page after tree shaking.

We currently have this toggle to automatically-accept validation errors, which results in excessive CSS being excluded:

image

What if an excessive_css validation error was a special case which instead defaulted to “New Rejected” status? On a Native mode site, this would result in the amp attribute being removed from the html element, and essentially serving an unmarked AMP page which would be able to take advantage of all the performance benefits of AMP except for being served from the AMP cache.

Should this auto-reject for excessive_css apply to Transitional mode as well or just Native mode? I'm thinking no, as the non-AMP version would be a better default that includes all the CSS. The primary problem today is Native mode sites that exclude CSS.

If we do this, it will be important to show a notice that too much CSS is on the page: #1801.

@felixarntz
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@felixarntz felixarntz commented May 15, 2019

I'm not sure on this. I think #2322 should definitely have more priority and be implemented (and even released) first so that we can get some real-world usage on whether it's sufficient for most cases or not.

The issue here would help mitigate an initial "everything is broken" reaction, but prioritization may already cover that sufficiently. Given the lack of consistency of treating excessive_css differently from other validation errors, I'd prefer to only do that if we still feel a need for it after the other improvements.

@amedina
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@amedina amedina commented May 16, 2019

This is important for any case where there is an excessive CSS validation error in Native mode. In Transitional, the site has the fall back of redirection to canonical in the presence of errors. In Native, with the assumption of auto sanitization by default, the only option in such cases is a broken site. If such case ever happens, however unlikely, this approach would provide a much better experience.

@westonruter
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@westonruter westonruter commented Jun 3, 2019

Also, in Transitional mode, I think redirection to the non-AMP version should be prevented when the user is logged-in. Otherwise, it would be annoying to see what the AMP version looks like, even though it has too much CSS.

@westonruter westonruter removed this from the v1.2 milestone Jun 7, 2019
@westonruter westonruter added this to the v1.3 milestone Jun 7, 2019
@westonruter westonruter added this to To do in v2.0 Planning Jul 15, 2019
@westonruter westonruter changed the title Discontinue excluding excessive CSS by default on Native mode sites Discontinue excluding excessive CSS by default on Standard mode sites Jul 15, 2019
@MackenzieHartung MackenzieHartung added this to Backlog in Ongoing Sep 17, 2019
@MackenzieHartung MackenzieHartung removed this from the v1.3 milestone Sep 17, 2019
@MackenzieHartung MackenzieHartung added this to the v1.3.1 milestone Sep 17, 2019
@schlessera
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@schlessera schlessera commented Sep 23, 2019

This messaging might need to be adapted as well as it will then be somewhat misleading:
Image 2019-09-23 at 3 30 11 PM

@schlessera schlessera moved this from Backlog to In Progress in Ongoing Sep 23, 2019
@schlessera schlessera self-assigned this Sep 23, 2019
@westonruter
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@westonruter westonruter commented Sep 23, 2019

Yes. I'm going to propose actually eliminating that checkbox altogether. Auto-accepting validation errors should be the norm. Any other behavior should be configured by filter.

@westonruter
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@westonruter westonruter commented Sep 24, 2019

In regards to where this code could go, one idea is inside of \AMP_Validation_Manager::is_sanitization_auto_accepted() and \AMP_Validation_Error_Taxonomy::get_validation_error_sanitization() as follows:

diff --git a/includes/validation/class-amp-validation-error-taxonomy.php b/includes/validation/class-amp-validation-error-taxonomy.php
index c9c5e242..7f7aa224 100644
--- a/includes/validation/class-amp-validation-error-taxonomy.php
+++ b/includes/validation/class-amp-validation-error-taxonomy.php
@@ -453,7 +453,7 @@ class AMP_Validation_Error_Taxonomy {
 		if ( ! empty( $term ) && in_array( $term->term_group, $statuses, true ) ) {
 			$term_status = $term->term_group;
 		} else {
-			$term_status = AMP_Validation_Manager::is_sanitization_auto_accepted() ? self::VALIDATION_ERROR_NEW_ACCEPTED_STATUS : self::VALIDATION_ERROR_NEW_REJECTED_STATUS;
+			$term_status = AMP_Validation_Manager::is_sanitization_auto_accepted( $error ) ? self::VALIDATION_ERROR_NEW_ACCEPTED_STATUS : self::VALIDATION_ERROR_NEW_REJECTED_STATUS;
 		}
 
 		$forced = false;
diff --git a/includes/validation/class-amp-validation-manager.php b/includes/validation/class-amp-validation-manager.php
index 7adb1302..a07da750 100644
--- a/includes/validation/class-amp-validation-manager.php
+++ b/includes/validation/class-amp-validation-manager.php
@@ -292,10 +292,14 @@ class AMP_Validation_Manager {
 	/**
 	 * Return whether sanitization is forcibly accepted, whether because in AMP-first mode or via user option.
 	 *
+	 * @param array $error Validation error.
 	 * @return bool Whether sanitization is forcibly accepted.
 	 */
-	public static function is_sanitization_auto_accepted() {
-		return amp_is_canonical() || AMP_Options_Manager::get_option( 'auto_accept_sanitization' );
+	public static function is_sanitization_auto_accepted( $error ) {
+		if ( $error && amp_is_canonical() && 'excessive_css' === $error['code'] ) {
+			return false;
+		}
+		return amp_is_canonical() || AMP_Options_Manager::get_option( 'auto_accept_sanitization' ); // @todo Eliminate auto_accept_sanitization altogether.
 	}
 
 	/**

Perhaps the return return value of AMP_Validation_Manager::is_sanitization_auto_accepted() should be filterable, allowing a site to decide which kinds of errors should default to being auto-accepted versus auto-rejected.

@schlessera
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@schlessera schlessera commented Sep 25, 2019

I already did a similar change, however the problem I'm facing right now is that:

  • the <amp-custom> is being stripped
  • the calculations are off, as the excessive CSS is part of the cumulative sum of bytes, so all of sudden, very small additional CSS is over the 50KB limit:

Image 2019-09-25 at 5 04 26 PM

I'm currently wading through the code to find out where and why that happens and how to solve it.

@schlessera
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@schlessera schlessera commented Sep 25, 2019

Btw, the change I made was this one:

Image 2019-09-25 at 5 09 18 PM

I'll test yours to see if that makes a difference.

@schlessera
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@schlessera schlessera commented Sep 25, 2019

With your version, at least the count seems to be better:

Image 2019-09-25 at 5 24 37 PM

Now I just need to find out how to avoid stripping the <amp-custom> tag...

@schlessera
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@schlessera schlessera commented Sep 25, 2019

I suspect the <amp-custom> is stripped by the tag&attribute sanitizer for exceeding its max-bytes...

@schlessera
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@schlessera schlessera commented Sep 25, 2019

So the issue seems to be that the <style amp-custom=""> tag throws a HTML_ELEMENT_ERROR_TYPE error:

Image 2019-09-25 at 5 42 11 PM

When I reject this one manually, the page loads with the proper styling.

@schlessera
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@schlessera schlessera commented Sep 25, 2019

Here's how a fresh validation looks like on my page:

Image 2019-09-25 at 5 44 21 PM

@schlessera
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@schlessera schlessera commented Sep 25, 2019

Overriding this error as an edge case for now. I'll send a PR.

@schlessera
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@schlessera schlessera commented Oct 18, 2019

Testing instructions:

  1. Install and activate the Query Monitor plugin.
  2. Open a page on the frontend while logged-in as admin. This should be a page that was not validated yet (or the validation should be reset).
  3. The validation screen for that URL will show that all validation errors of type excessive_css have been set to New Rejected (instead of `New Accepted) - see screenshot 1.
  4. When you view the page source for the generated page, its HTML should include a manifest of the CSS size distribution. This should go over 50KB in total, but still everything should be included - see screenshot 2.

Screenshot 1:

Image 2019-10-18 at 7 58 42 AM

Screenshot 2:

Image 2019-10-18 at 8 04 30 AM

@westonruter
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@westonruter westonruter commented Oct 18, 2019

Testing may also be performed by adding a style element to a Custom HTML block with a bunch of rules that match the current document.

@schlessera
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@schlessera schlessera commented Oct 18, 2019

@westonruter Yes, I thought about that too, but that is actually hard to do for a non-developer to reach 50KB...

@westonruter
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@westonruter westonruter commented Oct 18, 2019

That could paste this:

<style>
body:after {
    content: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa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a";
}
</style>

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@csossi csossi commented Oct 29, 2019

@schlessera , can you install the Query Monitor plug in for me here? Sorry, I don't have the creds for that

@csossi csossi moved this from Ready for QA to In Progress in Ongoing Oct 29, 2019
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@schlessera schlessera commented Oct 29, 2019

Me neither, @westonruter will need to do that.

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@schlessera schlessera commented Oct 29, 2019

Or you could use Weston's method to test up above: #2326 (comment)

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@westonruter westonruter commented Oct 29, 2019

Easier to use my method 😄

@westonruter westonruter moved this from In Progress to Ready for QA in Ongoing Oct 29, 2019
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@westonruter westonruter commented Oct 29, 2019

@csossi So the testing steps with my variation would be.

  1. Switch to standard mode.
  2. Create a new post and add a Custom HTML block that has my code above (#2326 (comment)), <style>html:after{ content:"aaaa...
  3. Save the post
  4. You should then see:

image

  1. But if you go to the frontend you should still see a whole bunch of aaaaaaa at the bottom of the page:

image

  1. If you click the “Review Issues” link you should see all of the excessive_css errors have been marked as “Kept”:

image

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@csossi csossi commented Nov 12, 2019

Hi @westonruter - not seeing the behaviour you're describing above. Didn't see error code warning at step 4, nor the content on the front-end (https://story-test-wordpress-amp.pantheonsite.io/?p=5564&preview=true) at step 5.

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@westonruter westonruter commented Nov 12, 2019

@csossi Here is an example: https://story-test-wordpress-amp.pantheonsite.io/wp-admin/post.php?post=5572&action=edit

image

I had to provide some attribute to the style element in order for it to be picked up. That may indicate a problem, but separate than what is being tested here. I see the excessive CSS is being kept as expected:

image

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@westonruter westonruter commented Nov 12, 2019

I had to provide some attribute to the style element in order for it to be picked up. That may indicate a problem, but separate than what is being tested here.

The issue here will be fixed by #3717. The issue is just that the text content of the style element was not making the validation error unique, so a previous validation error whose markup was removed was persisting for the new style element that has different contents.

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@csossi csossi commented Nov 12, 2019

Verified in QA

@csossi csossi moved this from Ready for QA to Done in Ongoing Nov 12, 2019
@kmyram kmyram removed this from To do in v2.0 Planning Jan 28, 2020
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